US10444931B2 - Vantage generation and interactive playback - Google Patents

Vantage generation and interactive playback Download PDF

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US10444931B2
US10444931B2 US15/590,841 US201715590841A US10444931B2 US 10444931 B2 US10444931 B2 US 10444931B2 US 201715590841 A US201715590841 A US 201715590841A US 10444931 B2 US10444931 B2 US 10444931B2
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vantages
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images
viewpoint
environment
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Kurt Akeley
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0481Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
    • G06F3/04815Interaction with three-dimensional environments, e.g. control of viewpoint to navigate in the environment
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • G06F3/012Head tracking input arrangements
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T13/00Animation
    • G06T13/203D [Three Dimensional] animation
    • G06T13/403D [Three Dimensional] animation of characters, e.g. humans, animals or virtual beings
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T19/00Manipulating 3D models or images for computer graphics
    • G06T19/006Mixed reality
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63FCARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
    • A63F2300/00Features of games using an electronically generated display having two or more dimensions, e.g. on a television screen, showing representations related to the game
    • A63F2300/80Features of games using an electronically generated display having two or more dimensions, e.g. on a television screen, showing representations related to the game specially adapted for executing a specific type of game
    • A63F2300/8082Virtual reality

Abstract

Video data of an environment may be prepared for presentation to a user in a virtual reality or augmented reality experience. According to one method, a plurality of locations distributed throughout a viewing volume may be designated, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations. For each location, a plurality of images of the environment, captured from viewpoints proximate the location, may be retrieved. For each location, the images may be reprojected to a three-dimensional shape and combined to generate a combined image. The combined image may be applied to one or more surfaces of the three-dimensional shape to generate a vantage. The vantages may be stored such that the vantages can be used to generate viewpoint video of the scene, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is related to U.S. application Ser. No. 15/590,808 for “Adaptive Control for Immersive Experience Delivery,” filed on the same date as the present application, the disclosure of which is incorporated herein by reference.

The present application is also related to U.S. application Ser. No. 15/590,877 for “Spatial Random Access Enabled Video System with a Three-Dimensional Viewing Volume,” filed on May 9, 2017 , the disclosure of which is incorporated herein by reference.

The present application is also related to U.S. application Ser. No. 15/590,951 for “Wedge-Based Light-Field Video Capture,” filed on May 9, 2017 the disclosure of which is incorporated herein by reference.

The present application is also related to U.S. application Ser. No. 14/837,465, for “Depth-Based Application of Image Effects,” filed Aug. 27, 2015, the disclosure of which is incorporated herein by reference in its entirety.

The present application is also related to U.S. application Ser. No. 14/834,924, for “Active Illumination for Enhanced Depth Map Generation,” filed Aug. 25, 2015, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present document relates to the generation of vantages to facilitate the presentation of virtual reality or augmented reality media.

BACKGROUND

As better and more immersive display devices are created for providing virtual reality (VR) and augmented reality (AR) environments, it is desirable to be able to capture high quality imagery and video for these systems. In a stereo VR environment, a user sees separate views for each eye; also, the user may turn and move his or her head while viewing. As a result, it is desirable that the user receive high-resolution stereo imagery that is consistent and correct for any viewing position and orientation in the volume within which a user may move his or her head.

The most immersive virtual reality and augmented reality experiences have six degrees of freedom, parallax, and view-dependent lighting. Generating viewpoint video for the user directly from the captured video data can be computationally intensive, resulting in a viewing experience with lag that detracts from the immersive character of the experience.

SUMMARY

Various embodiments of the described system and method prepare video data of an environment for presentation to a viewer in a virtual reality or augmented reality experience. In some embodiments, a processor may designate a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the virtual reality or augmented reality experience. Further, the processor may, for each of the locations, retrieve a plurality of images of the environment captured from viewpoints proximate the location and combine the images to generate a combined image to generate a vantage. A data store may store each of the vantages such that the vantages can be used to generate viewpoint video of the scene, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume.

In some embodiments, combining the images may include, for each subject pixel of the combined image, assigning a fitness value to each candidate pixel of each of the plurality of images that corresponds to the subject pixel, and setting the subject pixel to be the same as the candidate pixel that corresponds to the subject pixel and has the highest fitness value. Additionally or alternatively, the subject pixel may be set to a value that combines the values of multiple subject pixels that have high fitness values. The fitness value for each of the candidate pixels may represent a degree to which it is desirable to include the subject pixel in the virtual reality or augmented reality experience.

In some embodiments, the processor may, for each of the locations, reproject the images to a three-dimensional shape, and apply the combined image to one or more surfaces of the three-dimensional shape. The three-dimensional shape may be a mesh that contains a vantage location of the plurality of locations that corresponds to the vantage. Applying the combined image to one or more surfaces of the three-dimensional shape may include texture mapping the combined image to an interior of the mesh.

In some embodiments, the combined image may include color data and depth data for each of a plurality of pixels. The depth data may include an indication of a distance between a vantage location of the plurality of locations that corresponds to the vantage, and an object within the scene that is aligned with the pixel and the vantage location.

In some embodiments, the processor may, for each of the locations, generate a shape of the mesh based on the combined image. In at least one embodiment, the mesh generation that includes jitter is performed on individual images prior to reprojection. This is done for each camera image as it is reprojected to an individual vantage, and is done again for each vantage as it is reprojected to a final view as may be shown on a head-mounted display (HMD). Generation of the shape may include jittering vertices of the mesh toward discontinuities in the depth data for the combined image. Additionally or alternatively, generation of the shape may include classifying each face of the mesh, based on an orientation of the face, as a surface face or a silhouette face based on a degree to which the face is oriented toward the vantage location, and adjusting orientations of the silhouette faces to cause the silhouette faces to be deemphasized in the viewpoint video.

In some embodiments, the processor may use the vantages to generate the viewpoint video data. This may include identifying a subset of the vantages that are proximate the virtual viewpoint, and reprojecting at least portions of the combined images of the subset of the vantages to the virtual viewpoint. Identifying the subset of the vantages may include identifying four of the vantages that define corners of a tetrahedron, or vantages that define corners of another space-filling polyhedron, containing the virtual viewpoint. Thus, the vantages may be used to accurately and consistently generate the viewpoint video within the computational limitations of the computer hardware on which the experience is hosted.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate several embodiments. Together with the description, they serve to explain the principles of the embodiments. One skilled in the art will recognize that the particular embodiments illustrated in the drawings are merely exemplary, and are not intended to limit scope.

FIG. 1 is a diagram depicting planar projection according to one embodiment.

FIG. 2 is a diagram depicting planar reprojection according to one embodiment.

FIGS. 3, 4, and 5 are diagrams depicting occlusion and disocclusion, according to certain embodiments.

FIG. 6 is a diagram depicting the selection of the best pixels for an eye image computed as a combination of multiple camera images, according to one embodiment.

FIG. 7 is a diagram depicting a regular cuboid vantage distribution, according to one embodiment.

FIG. 8 is a diagram depicting the division of a cube as in FIG. 11 through the use of three planes, according to one embodiment.

FIG. 9 is a diagram depicting the division of a cube as in FIG. 11 into six tetrahedra, according to one embodiment.

FIG. 10 is a diagram depicting projection to a curved surface, according to one embodiment.

FIG. 11 is a diagram depicting axial depth and radial depth, according to one embodiment.

FIG. 12 is a diagram depicting planar reprojection, wherein radial depths in the reprojected image are measured from the center of depth, according to one embodiment.

FIG. 13 is a flow diagram depicting a method for delivering video for a virtual reality or augmented reality experience, according to one embodiment.

FIG. 14 is a screenshot diagram depicting a frame from a viewpoint video of a virtual reality experience, according to one embodiment.

FIG. 15 is a screenshot diagram depicting the screenshot diagram of FIG. 14, overlaid with a viewing volume for each of the eyes, according to one embodiment.

FIG. 16 is a screenshot diagram depicting the view after the headset has been moved forward, toward the scene of FIG. 14, according to one embodiment.

DETAILED DESCRIPTION

Multiple methods for capturing image and/or video data in a light-field volume and creating virtual views from such data are described. The described embodiments may provide for capturing continuous or nearly continuous light-field data from many or all directions facing away from the capture system, which may enable the generation of virtual views that are more accurate and/or allow viewers greater viewing freedom.

Definitions

For purposes of the description provided herein, the following definitions are used:

    • Augmented reality: an immersive viewing experience in which images presented to the viewer are based on the location and/or orientation of the viewer's head and/or eyes, and are presented in conjunction with the viewer's view of actual objects in the viewer's environment.
    • Center of perspective: The three-dimensional point from which rays may be extended through a surface of projection to points in a three-dimensional scene.
    • Combined image: an image such as an RGB or RGBD image generated by combining pixels from multiple source images.
    • Depth: a representation of distance between an object and/or corresponding image sample and the entrance pupil of the optics of the capture system.
    • Eye image: An RGB (or RGBD) image that has been interactively computed for one of the viewer's eyes, taking into account the position and/or orientation of the viewer's head.
    • HMD: Head-mounted display.
    • Image: a two-dimensional array of pixel values, or pixels, each specifying a value pertinent to that location of the image, such as hue, luminance, saturation, and/or depth. The pixels of an image may be interpreted as samples of a continuous two-dimensional function on the image plane. Each pixel has a two-dimensional position, typically its center, which defines the location of its sample in the image plane.
    • Input device: any device that receives input from a user.
    • Main lens, or “objective lens”: a lens or set of lenses that directs light from a scene toward an image sensor.
    • Planar image: An image whose pixel values are computed by planar projection.
    • Planar projection: A mapping of points in a three-dimensional scene onto a flat, two-dimensional surface. Depending on where the projection plane is placed, the two-dimensional surface point that is the projection of a three-dimensional scene point may be the intersection point of the surface with the ray that extends from the center of perspective through the three-dimensional scene point, or the projection of the three-dimensional scene point back through the center-of-perspective.
    • Plane of projection: The two-dimensional surface of a planar projection.
    • Processor: any processing device capable of processing digital data, which may be a microprocessor, ASIC, FPGA, or other type of processing device.
    • Ray bundle, “ray,” or “bundle”: a set of light rays recorded in aggregate by a single pixel in a photosensor.
    • Reprojected image: An RGBD image that is a reprojection of another source RGBD image.
    • Reprojection: The process of computing the sample values of a (reprojected) image from the sample values of a different (source) image whose center of perspective is generally not at the same three-dimensional position. This is a reprojection in the sense that the source image is itself a projection, and that the computed image is being computed from the source image, rather than by direct projection from the scene.
    • Reprojection angle: The angle between the source ray (from the source center of perspective to the scene point) and the reprojection ray (from the scene point to the reprojection center of perspective).
    • RGBD image (or RGBD image): Usually an RGBD planar image.
    • RGBD planar image (or RGBD image): An image whose pixels include both color and depth information. The color information may be encoded as independent red, green, and blue values (the RGB values) or may have a different encoding. The depth values may encode, for each sample, the distance from the center of perspective to the scene point whose projection resulted in the sample's color value.
    • Scene: an arrangement of objects and/or people to be filmed.
    • Sensor, “photosensor,” or “image sensor”: a light detector in a camera capable of generating images based on light received by the sensor.
    • Source image: An RGBD image that is being reprojected.
    • Stereo virtual reality: an extended form of virtual reality in which each eye is shown a different view of the virtual world, enabling stereoscopic three-dimensional perception.
    • Vantage: a portion of video data, such as an RGBD image, that exists as part of multiple portions of video data at centers of perspective distributed through a viewing volume.
    • Video data: a collection of data comprising imagery and/or audio components that capture a scene.
    • Viewing volume: a three-dimensional region from within which virtual views of a scene maybe generated.
    • Viewpoint video: imagery and/or sound comprising one or more virtual views.
    • Virtual reality: an immersive viewing experience in which images presented to the viewer are based on the location and/or orientation of the viewer's head and/or eyes.
    • Virtual view: a reconstructed view, typically for display in a virtual reality or augmented reality headset, which may be generated by resampling and/or interpolating data from a captured light-field volume.
    • Virtual viewpoint: the location, within a coordinate system and/or light-field volume, from which a virtual view is generated.

In addition, for ease of nomenclature, the term “camera” is used herein to refer to an image capture device or other data acquisition device. Such a data acquisition device can be any device or system for acquiring, recording, measuring, estimating, determining and/or computing data representative of a scene, including but not limited to two-dimensional image data, three-dimensional image data, and/or light-field data. Such a data acquisition device may include optics, sensors, and image processing electronics for acquiring data representative of a scene, using techniques that are well known in the art. One skilled in the art will recognize that many types of data acquisition devices can be used in connection with the present disclosure, and that the disclosure is not limited to cameras. Thus, the use of the term “camera” herein is intended to be illustrative and exemplary, but should not be considered to limit the scope of the disclosure. Specifically, any use of such term herein should be considered to refer to any suitable device for acquiring image data. Further, although the ensuing description focuses on video capture for use in virtual reality or augmented reality, the systems and methods described herein may be used in a much wider variety of video and/or imaging applications.

The phrase “virtual camera” refers to a designation of a position and/or orientation of a hypothetical camera from which a scene may be viewed. A virtual camera may, for example, be placed within a scene to mimic the actual position and/or orientation of a viewer's head, viewing the scene as part of a virtual reality or augmented reality experience.

Planar Projection

Projection may reduce information in a three-dimensional scene to information on a two-dimensional surface, and subsequently to sample values in a two-dimensional image. The information may include color, although any scene values may be projected. The surface may be flat, in which case the information on the surface corresponds directly to like-positioned pixels in the two-dimensional image. Alternatively, the projection surface may be curved, in which case the correspondence between surface values and image pixels may be more complex. Because planar projection is easier to depict and understand, it will be used in the following discussion of FIG. 1. However, the systems and methods set forth herein also function for images with non-planar projections as well. Thus, this discussion may be generalized to non-planar projections.

Referring to FIG. 1, a diagram 100 depicts planar projection, according to one embodiment. A camera (not shown) with high-quality optics and a relatively small aperture may be understood to capture a planar projection of the light reflecting off objects in a physical scene. The center of perspective 110 of this projection may be within the objective lens assembly, and may be understood to be the center of the entrance pupil (for purposes of analysis on the scene side of the lens) and of the exit pupil (for analysis on the sensor side of the lens). If the camera is carefully calibrated, distortions that cause the captured image to differ from that of an ideal planar projection may be substantially corrected through the use of various methods known in the art.

Color information may be computed for each pixel location in the camera-captured image through processing by a camera pipeline, as implemented in modern digital cameras and mobile devices. Depth information may also be computed for each pixel location in the camera-captured image. Certain digital cameras compute this information directly, for example by measuring the time of flight of photons from the scene object to the camera. If the camera does not provide pixel depths, they may be computed by evaluating the differences in apparent positions (the parallax) of scene points in multiple camera images with overlapping fields of view. Various depth computation systems and methods are set forth in U.S. application Ser. No. 14/837,465, for “Depth-Based Application of Image Effects,” filed Aug. 27, 2015, and U.S. application Ser. No. 14/834,924, for “Active Illumination for Enhanced Depth Map Generation,” filed Aug. 2, 2015, the disclosures of which are incorporated herein by reference in their entirety.

The results of processing a camera-captured image through a camera pipeline, and of computing pixel depths (if they are not provided by the camera), may be an RGB image or an RGBD image. Such images may encode both color and depth in each pixel. Color may be encoded as red, green, and blue values (RGB) or may have any other encoding. Depth may be encoded as metric distance or as normalized reciprocal distance (NWC depth), or with other encodings, and may further correspond to axial depth (measured perpendicular to the plane of projection) or as radial depth (measured along the ray from the center of perspective through the center of the pixel) or with other geometric measures.

Using the techniques of three-dimensional computer graphics, an RGBD image of a virtual scene may be computed with a virtual camera, substantially duplicating the operation of a physical camera in a physical scene (but without the requirement of correcting distortions from the ideal two-dimensional planar projection). The coordinates of scene points may be known during computer-graphic image generation, so pixel depths may be known directly, without requiring computation using multiple RGBD images or time-of-flight measurement.

Reprojection

As indicated previously, the goal may be interactive computation of eye images for viewpoint video for arbitrary positions and orientations. These eye images may be computed by direct projection from the scene, but the scene may no longer available. Thus, it may be necessary to compute the eye images from information in the RGBD camera images, a process that may be referred to as reprojection, because the RGBD camera images are themselves projections, and this step may involve computation of another projection from them.

Referring to FIG. 2, a diagram 200 depicts planar reprojection, according to one embodiment. During reprojection, each pixel in a camera image 210 may be mapped to a corresponding location (typically not a pixel center) in the reprojected eye image 220. If both images are planar projections, this correspondence may be computed as a transformation that is specified by a 4×4 matrix, using the mathematics developed for 3-D computer graphics. Examples are set forth in Computer Graphics, Principles and Practice, 3rd edition, Addison Wesley, 2014. Geometrically, the correspondence may be established by first computing the reprojected scene point 240 that corresponds to a camera pixel 230 by following the ray 250 from the camera image's center of perspective 110, through the camera pixel's center, to the camera-pixel-specified distance, and then projecting that scene point to the eye image, as depicted in FIG. 2.

Referring to FIGS. 3, 4, and 5, diagrams 300, 400, and 500 depict occlusion and disocclusion, according to certain embodiments. With continued reference to FIGS. 6 and 7, the following challenges may be observed about the reprojection process:

    • Resampling. Corresponding points in the reprojected image may not be pixel centers, falling instead at arbitrary locations between pixels. The resampling that is required to compute pixel-center values from these corresponding points may be carried out through the use of various methods known in the art.
    • Unidirectionality. The correspondence may be obtainable only from the camera image to the eye image, and not backward from the eye image to the camera image. One reason for this is that pixels in the eye image may have no a priori depths, so reverse mapping may not be possible.
    • Occlusion. If there are substantial differences in the depths of pixels in the camera image, then multiple camera pixels may map to the same pixel in the eye image. The diagram 300 of FIG. 3 illustrates a simple example in which a nearer object 310 occludes a background 320, and the eye image 220 sees less of the background 320 than the camera image 210.
    • Disocclusion. Just as multiple camera pixels may map to an eye pixel, it is also possible that no pixels map to an eye pixel. The diagram 400 of FIG. 4 illustrates a simple example in which a nearer object 310 occludes a background 320, and the eye image 220 sees more of the background 320 than the camera image 210, or rather would see more of the background 320 than the camera image 210 if it were computed as a projection from the actual scene. Regions of eye pixels to which no camera pixels correspond may be referred to as disocclusions because they expose (disocclude) portions of the scene that were not visible in the images captured by the camera(s). A single scene object may cause both occlusion and disocclusion, as depicted in the diagram 500 of FIG. 5.
      Image Formation by Reprojection

The challenges set forth above will be discussed in further detail below. In this discussion, the source (for example, RGBD) images and reprojected images will continue to be referred to as camera images and eye images, respectively.

Filling Disocclusions

Based on the discussion above, it can be seen that one difficulty in forming a complete eye image by reprojection is that the eye image formed by reprojecting a single camera image may have disocclusions. Of course objects that are not visible to one camera may be visible to another, so disocclusions may be filled by reprojecting multiple camera images. In this approach, each eye pixel may be computed from the set of non-occluded camera pixels that correspond to it.

Unfortunately, there is no guarantee that any camera-image pixels will map to a specific eye-image pixel. In other words, it is possible that a correctly formed eye-image includes a portion of the scene that no camera image sees. In this case, the values of disoccluded pixels may be inferred from the values of nearby pixels, a process that is known in the art as hallucination. Other approaches to assigning values (such as color and/or depth) to disoccluded pixels are possible.

Discarding Occluded Pixels

When multiple camera images are reprojected (perhaps to increase the likelihood of filling disocclusions by reprojection), the possibility increases that the set of camera pixels that map to an eye pixel will describe scene objects at more than one distance. Thus, pixels may be included that encode objects that are not visible to the eye. The pixel values in a correctly-formed eye image may advantageously avoid taking into account camera pixels that encode occluded objects; thus, it may be advantageous to identify and discard occluded pixels. Occluded pixels encode occluded scene objects, which are by definition farther from the eye than visible objects. Occluded pixels may therefore be identified by first computing, and then comparing, the depths of reprojected pixels. The computation may be geometrically obvious, and may be an automatic side effect of the transformation of three-dimensional points using 4×4 matrixes.

Handling View-Dependent Shading

The apparent color of a point in three-dimensional space may vary depending on the position of the viewer, a phenomenon known as view-dependent shading in the field of three-dimensional computer graphics. Because the cameras in the capture rig have their centers of perspective at different positions, it follows that camera pixels that map to the same scene point may have different colors. So when multiple camera pixels map to the same eye pixel, the pixel selection process may advantageously consider view-dependent shading in addition to occlusion.

Except in the extreme case of a perfectly reflective object, view-dependent shading may result in mathematically continuous variation in apparent color as the view position is moved. Thus, pixels from a camera near the eye are more likely to correctly convey color than are pixels from cameras further from the eye. More precisely, for a specific eye pixel, the best camera pixel may be the non-occluded pixel that maps to that eye pixel and whose mapping has the smallest reprojection angle (the angle 270 between the camera ray 250 and the eye ray 260, as depicted in FIG. 2).

Achieving High Performance

To form a high-quality eye image, it may be advantageous to identify the best camera pixels and use them to compute each eye pixel. Unfortunately, the unidirectionality of reprojection, and the scene-dependent properties of occlusion and disocclusion, make it difficult to directly determine which camera image has the best pixel for a given eye pixel. Further, the properties of view-dependent shading make it certain that, for many view positions, the best camera pixels will be distributed among many of the camera images.

Referring to FIG. 6, a diagram 600 depicts the selection of the best pixels for an eye image 610 computed as a combination of multiple camera images 620, according to one embodiment. Multiple camera pixels from a substantial number of the camera images 620 may be reprojected and tested to identify which is best. This may make it challenging to maintain performance, as identification of the best pixel may be computationally intensive.

Vantages

Video data of an environment may be prepared for use in the presentation of an immersive experience, such as a virtual reality or augmented reality experience. Such an experience may have a designated viewing volume, relative to the environment, within which a viewer can freely position his or her head to view the environment from the corresponding position and viewing direction. The view generated for the viewer may be termed “viewpoint video.” The goal may be to capture video of an environment, then to allow the viewer to enter and move around within a live playback of the captured scene, experiencing it as though he or she were present in the environment. Viewer motion may be arbitrary within a constrained volume called the viewing volume. The viewing experience is immersive, meaning that the viewer sees the environment from his or her position and orientation as though he or she were actually in the scene at that position and orientation.

The video data may be captured with a plurality of cameras, each attached to a capture rig such as a tiled camera array, with positions and orientations chosen such that the cameras' fields of view overlap within the desired capture field of view. The video data may be processed into an intermediate format to better support interactive playback. The viewer may wear a head-mounted display (HMD) such as the Oculus, which both tracks the viewer's head position and orientation, and facilitates the display of separately computed images to each eye at a high (e.g., 90 Hz) frame rate.

For playback to be immersive, the images presented to the viewer's eyes are ideally correct for both the position and orientation of his eyes. In general, the position and orientation of an eye will not match that of any camera, so it may be necessary to compute the eye's image from one or more camera images at position(s) and/or orientation(s) that are different from those of the eye. There are many challenges involved in the performance of these computations, or reprojections, as described previously, to generate views interactively and with sufficient quality. This disclosure outlines some of the challenges and identifies aspects of intermediate formats that may help to surmount them.

More specifically, in order to ensure that performance can be maintained in a manner that avoids disruption of the virtual reality or augmented reality experience as eye images are generated for viewpoint video, reprojection may be carried out twice. First, as a non-time-critical preprocessing step (before the experience is initiated), the camera images may be reprojected into vantages. Each vantage may include an RGBD image whose centers of perspective are distributed throughout the three-dimensional viewing volume. During this step, there is time to reproject as many camera images as necessary to find the best camera pixels for each vantage pixel.

Each of the vantages may be an image computed from the camera images. The vantages may have positions that are distributed throughout a 3D viewing volume. Viewpoint video can then be interactively computed from the vantages rather than directly from the camera images (or generally from images corresponding to the camera positions). Each vantage may represent a view of the environment from the corresponding location, and may thus be a reprojected image. Metadata may be added to the reprojection that defines each vantage; the metadata may include, for example, the location of the vantage in three-dimensional space.

Vantages may, in some embodiments, be evenly distributed throughout a viewing volume. In the alternative, the vantages may be unevenly distributed. For example, vantage density may be greater in portions of the viewing volume that are expected to be more likely to be visited and/or of greater interest to the viewer of the experience.

Reprojection of the video data into the vantages may also include color distribution adjustments. This may enable proper display of reflections, bright spots, and/or other shading aspects that vary based on the viewpoint from which the scene is viewed. In at least one embodiment, eye images are generated by reprojecting vantages whose center of perspective are near the eye positions. These vantages thus have view-dependent shading effects that are similar to those that the eye would experience if it were positioned in the actual scene.

Vantages and tiles are also described in the above-cited related U.S. application Ser. No. 15/590,877 for “Spatial Random Access Enabled Video System with a Three-Dimensional Viewing Volume,” filed on May 9, 2017, the disclosure of which is incorporated herein by reference in its entirety. One exemplary method for generating such vantages will be shown and described subsequently, in connection with FIG. 13.

Once all the vantages exist, eye images may be formed interactively (during the experience), reprojecting only the small number of vantages (for example, four) whose centers of perspective tightly surround the eye position. Vantages may be distributed throughout the viewing volume to ensure that such vantages exist for all eye positions within the viewing volume. Thus, all vantage pixels may provide accurate (if not ideal) view-dependent shading. By selecting vantages that surround the eye, it may be likely that at least one vantage “sees” farther behind simple occlusions (such as the edges of convex objects) than the eye does. Accordingly, disocclusions are likely to be filled in the eye images.

It may be desirable to reproject the viewpoint video from the vantages in such a manner that centers of perspective can be altered without jarring changes. As the viewer moves between vantages, the change in imagery should be gradual, unless there is a reason for a sudden change. Thus, it may be desirable to generate the viewpoint video as a function of the vantages at the vertices of a polyhedron. As the viewer's viewpoint moves close to one vertex of the polyhedron, that vantage may provide the bulk of the viewpoint video delivered to the viewer.

Moving within the polyhedron may cause the viewpoint video to contain a different mix of the vantages at the vertices of the polyhedron. Positioning the viewpoint on the face of the polyhedron may cause only the vantages on that face to be used in the calculation of the viewpoint video. As the viewpoint moves into a new polyhedron, the vantages of that polyhedron may be used to generate the viewpoint video. The viewpoint video may always be a linear combination of the vantages at the vertices of the polyhedron containing the viewpoint to be rendered. A linear interpolation, or “lerp” function may be used. Barycentric interpolation may additionally or alternatively be used for polyhedra that are tetrahedral or cuboid in shape. Other types of interpolation may be used for other types of space-filling polyhedra.

In some embodiments, in order to enable efficient identification of the four vantages that closely surround the eye, vantage positions may be specified as the vertices of a space-filling set of polyhedra in the form of tetrahedra. The tetrahedra may be sized to meet any desired upper bound on the distance of the eye from a surrounding vantage. While it is not possible to fill space with Platonic tetrahedra, many other three-dimensional tilings are possible. For example, the view volume may be tiled with regular cuboids, as depicted in FIG. 7.

Referring to FIG. 7, a diagram 700 depicts a regular cuboid vantage distribution, according to one embodiment. Vantages 710 may be distributed such that groups of eight adjacent vantages 710 may cooperate to define the corners of a cube 720. Each cube 720 may then subdivided as depicted in FIG. 8.

Referring to FIG. 8, a diagram 800 depicts the division of a cube 720 as in FIG. 7 through the use of three planes 810, according to one embodiment. Each of the planes 810 may pass through four vertices (i.e., four vantages 710) of the cube 720.

Referring to FIG. 9, a diagram 900 depicts the division of a cube 720 as in FIG. 7 into six tetrahedra 910, according to one embodiment. The tetrahedra 910 may share the vertices of the cube 720, which may be vantages as described above. The tetrahedra 910 may subdivide opposing faces of the cube 720 into the same pair of triangular facets. Eye images for a viewpoint 920 with one of the tetrahedra 910 may be rendered by reprojecting the images of the vantages 710 at the vertices of the tetrahedron.

It may desirable for the tetrahedra 910 to match up at faces of the cube 720. This may be accomplished by either subdividing appropriately, or by reflecting the subdivision of the cube 720 at odd positions in each of the three dimensions. In some embodiments subdivisions that match at cuboid faces may better support Barycentric interpolation, which will be discussed subsequently, and is further set forth in Barycentric Coordinates for Convex Sets, Warren, J., Schaefer, S., Hirani, A. N. et al., Adv Comput Math (2007) 27:319.

In alternative embodiments, other polyhedra besides tetrahedra may be used to tile the viewing volume. Generally, such polyhedra may require that more vantages be at considered during eye image formation. For example, the cuboid tiling may be used directly, with a viewpoint within the cube 720 rendered based on reprojection of the vantages 710 at the corners of the cube 720. However, in such a case, eight vantages would need to be used to render the eye images. Accordingly, the use of tiled tetrahedra may provide computational advantages. In other embodiments, irregular spacing of polyhedral may be used. This may help reduce the number of vantages that need to be created and stored, but may also require additional computation to determine which of the polyhedra contains the viewer's current viewpoint.

A further benefit may be derived from polyhedral tiling. Barycentric interpolation may be used to compute the relative closeness of the eye position to each of the four surrounding vantages. These relative distances may be converted to weights used to linearly combine non-occluded vantage pixels at each eye pixel, rather than simply selecting the best among them. As known in the three-dimensional graphic arts, such linear combination (often referred to as lerping) may ensure that eye pixels change color smoothly, not suddenly, as the eye position is moved incrementally. This is true in a static scene and may remain approximately true when objects and lighting in the scene are dynamic.

Barycentric interpolation is particularly desirable because it is easy to compute and has properties that ensure smoothness as the eye position moves from one polyhedron to another. Specifically, when the eye is on a polyhedron facet, only the vertices that define that facet have non-zero weights. As a result, two polyhedra that share a facet may agree on all vertex weights because all but those at the facet vertices may be zero, while those on the facet may be identical. Hence, there may be no sudden change in color as the viewer moves his or her eyes within the viewing volume, from one polyhedron to another.

Another property of Barycentric interpolation, however, is that when the eye is inside the polyhedron, rather than on a facet surface, all polyhedron vertex weights may be nonzero. Accordingly, all vantages may advantageously be reprojected and their pixels lerped to ensure continuity in color as the eye moves through the polyhedron. Thus performance may be optimized by tiling with the polyhedron that has the fewest vertices, which is the tetrahedron.

Non-Planar Projection

Cameras and eyes typically have fields of view that are much smaller than 180°. Accordingly, their images can be represented as planar projections. However, it may be desirable for vantages to have much larger fields of view, such as full 360°×180; it is not possible to represent images with such large fields of view as planar projections. Their surfaces of projection must be curved. Fortunately, all of the techniques described previously work equally well with non-planar projections.

Referring to FIG. 10, a diagram 1000 depicts projection to a curved surface 1010, according to one embodiment. The curved surface 1010 may be spherical. Because a sphere cannot be flattened onto a rectangle, a further distortion (e.g., an equirectangular distortion) may be needed to convert spherical projection coordinates to image coordinates. Such distortion may be carried out in the process of reprojecting the images to the three-dimensional shape.

Virtual Cameras and Scenes

Just as vantages may be created from images of a physical scene captured by a physical camera, they may also be created from images created by virtual cameras of a virtual scene, using the techniques of three-dimensional computer graphics. Vantages may be composed of physical images, virtual images, and/or a mixture of physical and virtual images. Any techniques known in the art for rendering and/or reprojecting a three-dimensional scene may be used. It is furthermore possible that vantages be rendered directly (or in any combination of reprojection and direct rendering) using virtual cameras, which may populate a three-dimensional volume without occluding each other's views of the virtual scene.

Center of Depth

As described thus far, depth values in an RGBD image may be measured relative to the center of perspective, such as the center of perspective 110 in FIG. 1. Specifically, radial depths may be measured from the center of perspective along the ray to the nearest scene point, and axial depths may be measured perpendicular to the plane of projection, from the plane that includes the center of perspective to the plane that includes the scene point. This will be shown and described in connection with FIG. 11.

Referring to FIG. 11, a diagram 1100 depicts axial depth 1110 and radial depth 1120, according to one embodiment. As shown, the axial depth 1110 may be perpendicular to the plane of projection 1130. Conversely, the radial depth 1120 may be parallel to the ray 1140 passing from the center of perspective 110 to the point 1150 to be reprojected.

The depth values in RGBD vantages may be computed in a different manner, relative to a shared center of depth, rather than to the center of perspective of that vantage. The shared point may be at the center of a distribution of vantages, for example. And although both radial and axial depth values may be measured relative to a point other than the center of perspective, measuring depth radially from a shared center of depth has multiple properties that may be advantageous for vantages, including but not limited to the following:

    • 1. Radial depth values for a given scene point may match in all vantages that include a projection of that scene point, regardless of the positions of the vantages.
    • 2. If the represented precision of depth values is itself a function of the absolute depth value (as when, for example, depths are stored as reciprocals rather than as metric values), then the depth values for a given scene point may have the same precision in each vantage because they have the same value.
    • 3. If the representation of depth values has a range (as it does when, for example, reciprocals of metric depth values are normalized to a range of zero through one) then all vantages may share the same metric range.

Referring to FIG. 12, a diagram 1200 depicts planar reprojection, wherein, rather than measuring radial depths in the reprojected image from the center of perspective, the radial depths in the reprojected image are measured from a center point called the center of depth, according to one embodiment. During projection, depths in RGBD pixels may be computed relative to a center of depth 1210 by simply computing the distance from the scene point 1220 to the center of depth 1210. During reprojection, the inverse calculation may be made to compute the (reprojected or recomputed) scene point 1230 from an RGBD pixel, for example, at the scene point 1220. This calculation may involve solving a system of two equations. One equation may specify that the recomputed scene point 1230 lies on a sphere 1240 centered at the center of depth 1210, with radius 1250 equal to the pixel's depth. The other equation may specify that the point lies on the ray 1260 that extends from the center of perspective 110 through the center of the pixel at the scene point 1220. Such ray-sphere intersections are used extensively in three-dimensional computer graphics, especially during rendering via a variety of algorithms known as ray tracing algorithms. Many such algorithms are known in the art. Some examples are provided in, for example, Mapping Between Sphere, Disk, and Square, Martin Lambers, Journal of Computer Graphics Techniques, Volume 5, Number 2, 2016.

Vantage Generation

Referring to FIG. 13, a flow diagram depicts a method 1300 for preparing video data of an environment for a virtual reality or augmented reality experience, according to one embodiment. As shown, the method 1300 may start 1310 with a step 1320 in which video data is stored. The video data may encompass video from multiple viewpoints and/or viewing directions within a viewing volume that can be selectively delivered to the viewer based on the position and/or orientation of the viewer's head within the viewing volume, thus providing an immersive experience for the viewer. The video data may be volumetric video, which may be captured through the use of light-field cameras as described previously, or through the use of conventional cameras.

In a step 1322, the video data may be pre-processed. Pre-processing may entail application of one or more steps known in the art for processing video data, or more particularly, light-field video data. In some embodiments, the step 1322 may include adding depth to the video stream through the use of depth data captured contemporaneously with the video data (for example, through the use of LiDAR or other depth measurement systems) and/or via application of various computational steps to extract depth information from the video stream itself.

In a step 1324, the video data may be post-processed. Post-processing may entail application of one or more steps known in the art for processing video data, or more particularly, light-field video data. In some embodiments, the step 1324 may include color balancing, artifact removal, blurring, sharpening, and/or any other process known in the processing of conventional and/or light-field video data.

In a step 1330, a plurality of locations may be designated within a viewing volume. The locations may be distributed throughout the viewing volume such that one or more vantages are close to each possible position of the viewer's head within the viewing volume. Thus, the vantages may be used to generate viewpoint video with accuracy. Notably, the viewing volume may move or change in shape over time, relative to the environment. Thus, the locations of vantages may be designated for each of multiple time frames within the duration of the experience.

The locations may be designated automatically through the use of various computer algorithms, designated manually by one or more individuals, or designated through a combination of automated and manual methods. In some examples, the locations may be automatically positioned, for example, in an even density within the viewing volume. Then, one or more individuals, such as directors or editors, may modify the locations of the vantages in order to decide which content should be presented with greater quality and/or speed. Use of importance metrics to set vantage locations is set forth in the above-cited related U.S. application Ser.No. 15/590,808 for “Adaptive Control for Immersive Experience Delivery,”filed on May 9, 2017, the disclosure of which is incorporated herein by reference in its entirety.

In a step 1340, for each of the locations, images may be retrieved from the video data, from capture locations representing viewpoints proximate the location. The images may, in some embodiments, be images directly captured by a camera or sensor of a camera array positioned proximate the location. Additionally or alternatively, the images may be derived from directly captured images through the use of various extrapolation and/or combination techniques.

The images retrieved in the step 1340 may optionally include not only color data, such as RGB values, for each pixel, but also depth data. Thus, the images may, for example, be in RGBD format, with values for red, green, blue, and depth for each pixel. The depth values for the pixels may be measured during capture of the image through the use of depth measurement sensors, such as LiDAR modules and the like, or the depth values may be computed by comparing images captured by cameras or sensors at different locations, according to various methods known in the art.

In some embodiments, the output from the cameras used to capture the video data may be stored in two files per camera image: 00000_rgba.exr and 00000_adist.exr. The RGBA file is a 4-channel half-float EXR image, with linear SRGB-space color encoding and alpha indicating confidence in the validity of the pixel. Zero may represent no confidence, while one may represent high confidence. Alpha may be converted to a binary validity: true (valid) if alpha is greater than one half, false (invalid) otherwise. The axial distance file is a 1-channel half-float EXR image, with pixels that are axial distances (parallel to the line of sight) from (the plane of) the center of perspective to the nearest surface in the scene. These distances may have to be positive to represent valid distances; zero may be used to indicate an invalid pixel. Further, these distances may all be within a range with a ratio of far-to-near that is less than 100. The ratio of far-to-near of the range may beneficially be closer to ten.

In some embodiments, the following two files per camera image may exist: 00000.rgb.jpeg and 00000.z.bus. The RGB file may be a standard JPEG compression, using SRGB nonlinear encoding or the like. In other examples, other encoding methods similar to JPEG non-linear encoding may be used. The Z file contains radial z values in normalized window coordinates, represented as 16-bit unsigned integers. The term “normalized window coordinates” is used loosely because the depth values may be transformed using the NWC transform, but may be radial, not axial, and thus may not be true NWC coordinates. Alternatively, it is further possible to cause these radial distances to be measured from a point other than the center of perspective, for example, from the center of the camera or camera array used to capture the images. These output files may be further processed by compressing them using a GPU-supported vector quantization algorithm or the like.

In some embodiments, two JSON files are provided in addition to the image files captured by the camera or camera array. The first, captured_scene.json, describes the capture rig (camera locations, orientations, and fields of view) and the input and desired output file formats. The second, captured_resample.json, describes which and how many vantages are to be made, including details on the reprojection algorithm, the merge algorithm, and the projection type of the vantages. The projection type of the vantages may be, for example, cylindrical or equirectangular. This data may be referenced in steps of the method 1300, such as the step 1350 and the step 1360.

In a step 1350, the images (or, in the case of video, video streams) retrieved in the step 1340 may be reprojected to each corresponding vantage location. If desired, video data from many viewpoints may be used for each vantage, since this process need not be carried out in real-time, but may advantageously be performed prior to initiation of the virtual reality or augmented reality experience.

In a step 1360, the images reprojected in the step 1350 may be combined to generate a combined image. The reprojected images may be combined in various ways. According to some embodiments, the reprojected images may be combined by computing a fitness value for each pixel of the images to be combined. Linear interpolation may be used. The fitness value may be an indication of confidence in the accuracy of that pixel, and/or the desirability of making that pixel viewable by the viewer. A simple serial algorithm or the like may be used to select, for each pixel of the combined image for a location, the reprojected image pixel at the corresponding position that has the best fitness value. This may be the algorithm included in the captured_resample.json file referenced previously. There is no limit to the number of camera images that can be combined into a single combined image for a vantage. Neighboring vantage pixels may come from different cameras, so there is no guarantee of spatial coherence.

In a step 1390, the vantages may be used to generate viewpoint video for a user. This step can include reprojection and subsequent combination of vantage images. The viewpoint video may be generated in real-time based on the position and/or orientation of the viewer's head. The viewpoint video may thus present a user-movable view of the scene in the course of a virtual reality or augmented reality experience. The viewpoint video may, for any given frame, be generated by reprojecting multiple vantages to the viewer's viewpoint. A relatively small number of vantages may be used to enable this process to be carried out in real-time, so that the viewpoint video is delivered to the HMD with an imperceptible or nearly imperceptible delay. In some embodiments, only four vantages may be combined to reproject the viewpoint video.

Lerping and/or fitness values may again be used to facilitate and/or enhance the combination, as in the step 1360. If desired, the fitness values used in the step 1390 may be the same as those connected to the pixels that were retained for use in each vantage in the step 1360. Additionally or alternatively, new fitness values may be used, for example, based on the perceived relevance of each vantage to the viewpoint for which viewpoint video is to be generated.

Reprojection of vantages to generate viewpoint video may additionally or alternatively be carried out as set forth in the above-cited related U.S. application Ser.No. US 15/590,877 for “Spatial Random Access Enabled Video System with a Three-Dimensional Viewing Volume,”filed on May 9, 2017, the disclosure of which is incorporated herein by reference in its entirety.

In a step 1392, the viewpoint video may be displayed for the user. This may be done, for example, by displaying the video on a head-mounted display (HMD) worn by the user, and/or on a different display. The method 1300 may then end 1398.

The steps of the method 1300 may be reordered, omitted, replaced with alternative steps, and/or supplemented with additional steps not specifically described herein. The steps set forth above will be described in greater detail subsequently.

Virtual Reality Display

Referring to FIG. 14, a screenshot diagram 1400 depicts a frame from a viewpoint video of a virtual reality experience, according to one embodiment. As shown, the screenshot diagram 1400 depicts a left headset view 1410, which may be displayed for the viewer's left eye, and a right headset view 1420, which may be displayed for the viewer's right eye. The differences between the left headset view 1410 and the right headset view 1420 may provide a sense of depth, enhancing the viewer's perception of immersion in the scene. FIG. 14 may depict a frame, for each eye, of the viewpoint video generated in the step 1390.

Vantage Distribution

As indicated previously, the video data for a virtual reality or augmented reality experience may be divided into a plurality of vantages, each of which represents the view from one location in the viewing volume. More specifically, a vantage is a portion of video data, such as an RGBD image, that exists as part of multiple portions of video data at centers of perspective distributed through a viewing volume. A vantage can have any desired field-of-view (e.g. 90° horizontal×90° vertical, or 360° horizontal×180 vertical) and pixel resolution. A viewing volume may be populated with vantages in three-dimensional space at some density.

Based on the position of the viewer's head, which may be determined by measuring the position of the headset worn by the viewer, the system may interpolate from a set of vantages to render the viewpoint video in the form of the final left and right eye view, such as the left headset view 1410 and the right headset view 1420 of FIG. 14. A vantage may contain extra data such as depth maps, edge information, and/or the like to assist in interpolation of the vantage data to generate the viewpoint video.

The vantage density may be uniform throughout the viewing volume, or may be non-uniform. A non-uniform vantage density may enable the density of vantages in any region of the viewing volume to be determined based on the likelihood the associated content will be viewed, the quality of the associated content, and/or the like. Thus, if desired, importance metrics may be used to establish vantage density for any given region of a viewing volume.

Referring to FIG. 15, a screenshot diagram 1500 depicts the screenshot diagram 1400 of FIG. 14, overlaid with a viewing volume 1510 for each of the eyes, according to one embodiment. Each viewing volume 1510 may contain a plurality of vantages 1520, each of which defines a point in three-dimensional space from which the scene may be viewed by the viewer. Viewing from between the vantages 1520 may also be carried out by combining and/or extrapolating data from vantages 1520 adjacent to the viewpoint. The vantages 1520 may be positioned at the locations designated in the step 1330. In at least one embodiment, vantage 1520 positioning can be decoupled from those positions where cameras are situated.

Referring to FIG. 16, a screenshot diagram 1600 depicts the view after the headset has been moved forward, toward the scene of FIG. 14, according to one embodiment. Again, a left headset view 1610 and a right headset view 1620 are shown, with the vantages 1520 of FIG. 15 superimposed. Further, for each eye, currently and previously traversed vantages 1630 are highlighted, as well as the current viewing direction 1640.

The above description and referenced drawings set forth particular details with respect to possible embodiments. Those of skill in the art will appreciate that the techniques described herein may be practiced in other embodiments. First, the particular naming of the components, capitalization of terms, the attributes, data structures, or any other programming or structural aspect is not mandatory or significant, and the mechanisms that implement the techniques described herein may have different names, formats, or protocols. Further, the system may be implemented via a combination of hardware and software, as described, or entirely in hardware elements, or entirely in software elements. Also, the particular division of functionality between the various system components described herein is merely exemplary, and not mandatory; functions performed by a single system component may instead be performed by multiple components, and functions performed by multiple components may instead be performed by a single component.

Reference in the specification to “one embodiment” or to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least one embodiment. The appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.

Some embodiments may include a system or a method for performing the above-described techniques, either singly or in any combination. Other embodiments may include a computer program product comprising a non-transitory computer-readable storage medium and computer program code, encoded on the medium, for causing a processor in a computing device or other electronic device to perform the above-described techniques.

Some portions of the above are presented in terms of algorithms and symbolic representations of operations on data bits within a memory of a computing device. These algorithmic descriptions and representations are the means used by those skilled in the data processing arts to most effectively convey the substance of their work to others skilled in the art. An algorithm is here, and generally, conceived to be a self-consistent sequence of steps (instructions) leading to a desired result. The steps are those requiring physical manipulations of physical quantities. Usually, though not necessarily, these quantities take the form of electrical, magnetic or optical signals capable of being stored, transferred, combined, compared and otherwise manipulated. It is convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like. Furthermore, it is also convenient at times, to refer to certain arrangements of steps requiring physical manipulations of physical quantities as modules or code devices, without loss of generality.

It should be borne in mind, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise as apparent from the following discussion, it is appreciated that throughout the description, discussions utilizing terms such as “processing” or “computing” or “calculating” or “displaying” or “determining” or the like, refer to the action and processes of a computer system, or similar electronic computing module and/or device, that manipulates and transforms data represented as physical (electronic) quantities within the computer system memories or registers or other such information storage, transmission or display devices.

Certain aspects include process steps and instructions described herein in the form of an algorithm. It should be noted that the process steps and instructions of described herein can be embodied in software, firmware and/or hardware, and when embodied in software, can be downloaded to reside on and be operated from different platforms used by a variety of operating systems.

Some embodiments relate to an apparatus for performing the operations described herein. This apparatus may be specially constructed for the required purposes, or it may comprise a general-purpose computing device selectively activated or reconfigured by a computer program stored in the computing device. Such a computer program may be stored in a computer readable storage medium, such as, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, magnetic-optical disks, read-only memories (ROMs), random access memories (RAMs), EPROMs, EEPROMs, flash memory, solid state drives, magnetic or optical cards, application specific integrated circuits (ASICs), and/or any type of media suitable for storing electronic instructions, and each coupled to a computer system bus. Further, the computing devices referred to herein may include a single processor or may be architectures employing multiple processor designs for increased computing capability.

The algorithms and displays presented herein are not inherently related to any particular computing device, virtualized system, or other apparatus. Various general-purpose systems may also be used with programs in accordance with the teachings herein, or it may prove convenient to construct more specialized apparatus to perform the required method steps. The required structure for a variety of these systems will be apparent from the description provided herein. In addition, the techniques set forth herein are not described with reference to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the techniques described herein, and any references above to specific languages are provided for illustrative purposes only.

Accordingly, in various embodiments, the techniques described herein can be implemented as software, hardware, and/or other elements for controlling a computer system, computing device, or other electronic device, or any combination or plurality thereof. Such an electronic device can include, for example, a processor, an input device (such as a keyboard, mouse, touchpad, trackpad, joystick, trackball, microphone, and/or any combination thereof), an output device (such as a screen, speaker, and/or the like), memory, long-term storage (such as magnetic storage, optical storage, and/or the like), and/or network connectivity, according to techniques that are well known in the art. Such an electronic device may be portable or non-portable. Examples of electronic devices that may be used for implementing the techniques described herein include: a mobile phone, personal digital assistant, smartphone, kiosk, server computer, enterprise computing device, desktop computer, laptop computer, tablet computer, consumer electronic device, television, set-top box, or the like. An electronic device for implementing the techniques described herein may use any operating system such as, for example: Linux; Microsoft Windows, available from Microsoft Corporation of Redmond, Wash.; Mac OS X, available from Apple Inc. of Cupertino, Calif.; iOS, available from Apple Inc. of Cupertino, Calif.; Android, available from Google, Inc. of Mountain View, Calif.; and/or any other operating system that is adapted for use on the device.

In various embodiments, the techniques described herein can be implemented in a distributed processing environment, networked computing environment, or web-based computing environment. Elements can be implemented on client computing devices, servers, routers, and/or other network or non-network components. In some embodiments, the techniques described herein are implemented using a client/server architecture, wherein some components are implemented on one or more client computing devices and other components are implemented on one or more servers. In one embodiment, in the course of implementing the techniques of the present disclosure, client(s) request content from server(s), and server(s) return content in response to the requests. A browser may be installed at the client computing device for enabling such requests and responses, and for providing a user interface by which the user can initiate and control such interactions and view the presented content.

Any or all of the network components for implementing the described technology may, in some embodiments, be communicatively coupled with one another using any suitable electronic network, whether wired or wireless or any combination thereof, and using any suitable protocols for enabling such communication. One example of such a network is the Internet, although the techniques described herein can be implemented using other networks as well.

While a limited number of embodiments has been described herein, those skilled in the art, having benefit of the above description, will appreciate that other embodiments may be devised which do not depart from the scope of the claims. In addition, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, the disclosure is intended to be illustrative, but not limiting.

Claims (21)

What is claimed is:
1. A method for preparing video data of an environment for presentation to a viewer in an experience selected from virtual reality and augmented reality experiences, the method comprising:
at a processor, designating a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the experience;
at the processor, for each location of the plurality of the locations:
retrieving a plurality of images of the environment captured from viewpoints proximate the location; and
combining the images to generate a combined image to form a vantage, wherein combining the images comprises, for each subject pixel of the combined image, using linear interpolation to select color and/or depth data for the subject pixel based on corresponding color and/or depth data for each candidate pixel of each of the plurality of images that corresponds to the subject pixel; and
at a data store, storing each of the vantages such that the vantages can be used to generate viewpoint video of the environment, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume.
2. A method for preparing video data of an environment for presentation to a viewer in an experience selected from virtual reality and augmented reality experiences, the method comprising:
at a processor, designating a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the experience;
at the processor, for each location of the plurality of the locations:
retrieving a plurality of images of the environment captured from viewpoints proximate the location; and
combining the images to generate a combined image to form a vantage; and
at a data store, storing each of the vantages such that the vantages can be used to generate viewpoint video of the environment, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume, and further comprising, at the processor:
receiving a designation of the virtual viewpoint; and
using the vantages to generate the viewpoint video.
3. The method of claim 2, wherein using the vantages to generate the viewpoint video comprises combining the combined images from a plurality of the vantages.
4. The method of claim 3, wherein combining the combined images from a plurality of the vantages comprises:
assigning a fitness value to each candidate pixel of each of the combined images that corresponds to the subject pixel; and
setting the subject pixel to be the same as the candidate pixel that corresponds to the subject pixel and has the highest fitness value;
wherein the fitness value for each of the candidate pixels represents a degree to which it is desirable to include the subject pixel in the experience.
5. The method of claim 3, wherein combining the combined images from a plurality of the vantages comprises, for each subject pixel of the viewpoint video, using linear interpolation to select color and/or depth data for the subject pixel based on corresponding color and/or depth data for each candidate pixel of each of the combined images that corresponds to the subject pixel.
6. The method of claim 3, wherein using the vantages to generate the viewpoint video comprises:
identifying a subset of the vantages that are proximate the virtual viewpoint; and
reprojecting at least portions of the combined images of the subset of the vantages to the virtual viewpoint.
7. The method of claim 6, wherein identifying the subset of the vantages comprises identifying vertices of a polyhedron containing the virtual viewpoint.
8. The method of claim 7, wherein:
the polyhedron comprises a tetrahedron; and
identifying the vertices of the polyhedron comprises identifying four of the vantages that define corners of the tetrahedron.
9. A method for preparing video data of an environment for presentation to a viewer in an experience selected from virtual reality and augmented reality experiences, the method comprising:
at a processor, designating a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the experience;
at the processor, for each location of the plurality of the locations:
retrieving a plurality of images of the environment captured from viewpoints proximate the location; and
combining the images to generate a combined image to form a vantage; and
at a data store, storing each of the vantages such that the vantages can be used to generate viewpoint video of the environment, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume, wherein designating a plurality of locations comprises spacing the plurality of locations apart at irregular intervals.
10. A non-transitory computer-readable medium for preparing video data of an environment for presentation to a viewer in an experience selected from virtual reality and augmented reality experiences, comprising instructions stored thereon, that when executed by a processor, cause the processor to perform the steps of:
designating a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the experience;
for each location of the plurality of the locations:
retrieving a plurality of images of the environment captured from viewpoints proximate the location; and
combining the images to generate a combined image to form a vantage; and
causing a data store to store each of the vantages such that the vantages can be used to generate viewpoint video of the environment, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume,
receiving designation of the virtual viewpoint; and
using the vantages to generate the viewpoint video.
11. The non-transitory computer-readable medium of claim 10, wherein:
using the vantages to generate the viewpoint video comprises combining the combined images from a plurality of the vantages; and
combining the combined images from a plurality of the vantages comprises:
assigning a fitness value to each candidate pixel of each of the combined images that corresponds to the subject pixel; and
setting the subject pixel to be the same as the candidate pixel that corresponds to the subject pixel and has the highest fitness value;
wherein the fitness value for each of the candidate pixels represents a degree to which it is desirable to include the subject pixel in the experience.
12. The non-transitory computer-readable medium of claim 10, wherein:
using the vantages to generate the viewpoint video comprises combining the combined images from a plurality of the vantages; and
combining the combined images from a plurality of the vantages comprises, for each subject pixel of the viewpoint video, using linear interpolation to select color and/or depth data for the subject pixel based on corresponding color and/or depth data for each candidate pixel of each of the combined images that corresponds to the subject pixel.
13. The non-transitory computer-readable medium of claim 10, wherein using the vantages to generate the viewpoint video comprises:
identifying a subset of the vantages that are proximate the virtual viewpoint by identifying vertices of a polyhedron containing the virtual viewpoint; and
combining the combined images from the subset of the vantages by reprojecting at least portions of the combined images of the subset of the vantages to the virtual viewpoint.
14. The non-transitory computer-readable medium of claim 13, wherein:
the polyhedron comprises a tetrahedron; and
identifying the vertices of the polyhedron comprises identifying four of the vantages that define corners of the tetrahedron.
15. A system for preparing video data of an environment for presentation to a viewer in an experience selected from virtual reality and augmented reality experiences, the system comprising:
a processor configured to:
designate a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the experience; and
for each location of the plurality of the locations:
retrieve a plurality of images of the environment captured from viewpoints proximate the location; and
combine the images to generate a combined image to form a vantage; and
a data store communicatively coupled to the processor, configured to store each of the vantages such that the vantages can be used to generate viewpoint video of the environment, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume, wherein the processor is further configured to combine the images by, for each subject pixel of the combined image, using linear interpolation to select color and/or depth data for the subject pixel based on corresponding color and/or depth data for each candidate pixel of each of the plurality of images that corresponds to the subject pixel.
16. A system for preparing video data of an environment for presentation to a viewer in an experience selected from virtual reality and augmented reality experiences, the system comprising:
a processor configured to:
designate a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the experience; and
for each location of the plurality of the locations:
retrieve a plurality of images of the environment captured from viewpoints proximate the location; and
combine the images to generate a combined image to form a vantage; and
a data store communicatively coupled to the processor, configured to store each of the vantages such that the vantages can be used to generate viewpoint video of the environment, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume, wherein the processor is further configured to:
receive designation of the virtual viewpoint; and
use the vantages to generate the viewpoint video.
17. The system of claim 16, wherein the processor is further configured to use the vantages to generate the viewpoint video by combining the combined images from a plurality of the vantages by, for each subject pixel of the viewpoint video:
assigning a fitness value to each candidate pixel of each of the combined images that corresponds to the subject pixel; and
setting the subject pixel to be the same as the candidate pixel that corresponds to the subject pixel and has the highest fitness value;
wherein the fitness value for each of the candidate pixels represents a degree to which it is desirable to include the subject pixel in the experience.
18. The system of claim 16, wherein the processor is further configured to use the vantages to generate the viewpoint video by combining the combined images from a plurality of the vantages by, for each subject pixel of the viewpoint video, using linear interpolation to select color and/or depth data for the subject pixel based on corresponding color and/or depth data for each candidate pixel of each of the combined images that corresponds to the subject pixel.
19. The system of claim 16, wherein the processor is further configured to use the vantages to generate the viewpoint video by:
identifying a subset of the vantages that are proximate the virtual viewpoint by identifying vertices of a polyhedron containing the virtual viewpoint; and
combining the combined images from the subset of the vantages by reprojecting at least portions of the combined images of the subset of the vantages to the virtual viewpoint.
20. The system of claim 19, wherein:
the polyhedron comprises a tetrahedron; and
the processor is further configured to identify the vertices of the polyhedron by identifying four of the vantages that define corners of the tetrahedron.
21. A system for preparing video data of an environment for presentation to a viewer in an experience selected from virtual reality and augmented reality experiences, the system comprising:
a processor configured to:
designate a plurality of locations, distributed throughout a viewing volume, at which a plurality of vantages are to be positioned to facilitate viewing of the environment from proximate the locations in the experience; and
for each location of the plurality of the locations:
retrieve a plurality of images of the environment captured from viewpoints proximate the location; and
combine the images to generate a combined image to form a vantage; and
a data store communicatively coupled to the processor, configured to store each of the vantages such that the vantages can be used to generate viewpoint video of the environment, as viewed from a virtual viewpoint corresponding to an actual viewer's viewpoint within the viewing volume, wherein the processor is further configured to designate the plurality of locations by spacing the plurality of locations apart at irregular intervals.
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